+ 1017 (div. 4)—14/4/2025 +
+
+ Decent contest. Lost focus near the end and was not paying attention
+ at the start (I was working on my makefile). This is a telltale sign
+ that Div. 4 is a bit too easy. F & G should've been lightwork.
+
+ -
+
- + D: submitted what I knew to be incorrect. Can't account for + laziness. + +
- E: long long overflow. Laziness. +
- + F: lost focus here and did not prove the correctness. Was confused + by the grid—simply breaking down and experimenting in + terms of simple patterns would help isolate that a mutation after + \(m%K==0\) is key. Then, a subsequent rigorous proof of the modulo + shift would help. + +
- + G: gave up after a few insights and did not persevere to find the + simple mathematical equation for updating the score on reversal + although I got the deque intution. + Sometimes, there's nothing to learn besides improving your + discipline. + +
- + My math intuition needs to improve. I see something hard (i.e. + dividing out a number repeatedly) then think "this is impossible" + rather than "this seems hard, but is it feasible? Is it + computationally practical?" In this case, I know the solution + rests on the fact of only a logarithmic (?) amount of numbers can + end up dividing \(a[i]\). Time to upsolve later. + +